Steady-rest mechanism for grinding machines



Dec. 27, 19m; 1,654,213

S. EINSTEIN ET AL STEADY REST MECHANISM FOR GRINDING MACHINES Filed April 28. 1926 2 Sheets-Sheet 1 I 25 52 ma /0 /0* /9 Dec. 27, 1927. 1,654,213

s. EINSTEIN ET AL STEADY BEST MECHANISM FOR GRINDING MACHINES Filed April 28. 1926 2 Sheets-Sheet 2 56 59 /0 1/ 1 7 5 my if: I Fawn-7mm} g2 II as 1 J W i JET/Islam Miami/29W attorney hill Patented Dec. 27, 1927.

UNITED STATES PATENT OFFICE.

5501] EINSTEIN AND LESTER I1. NENNINGER, OF CINCINNATI, OHIO, ASSIGNORS, BY HEIRS-NE AESIGNMENTS, TO CINCINNATI GRINDIEES INCORPORATED, OF CINCINNATI,

onto, a conroriarlon or OHIO.

srnanwransr mnonanxsm Application filed April 28,

this invention relates to il'l'i 'urovements .eady rest mechanism lor grinding machines.

In the prodtu'tion oi. cylindrical articles in center grinding machines, it is necessary that there be arelative feeding movement between. the work and the grinding wheel. operating upon the work. This feeding movement res ts in a pressure of the wheel against the work, which in the case of long work-pieces tends to centrally spring the worlr, so that the reduction the central part is less than that at the more rigidly held end. portions thereof. j

To overconiie this difficulty use is made o't means for backing up the work to prevent such springing action. As the worlv is duced it is necessary that these backing up u'iembors be suitably sliii'ited toward the work to compensate for the amount of matorial which has been removed therefrom.

It is therefore the purpose of the present invention to provide a novel and intiproved structure of steady rest which may be quickly and easily placed in desired position on the grinding lTlEtCl'llllO table, which shall possess a plurality 01 parts for independent engagement witli the worlepiece at dilterent points around the periphery thereof, which work-engaging members. shall be capable of ready adjustment to maintain proper contact. i

A. further object of the invention is the provision of novel and improved means for limiting the movement of said steadying de ices against the work, which shall be independent of the adj sting mechanisms and. shall thus facilitate repeated. adjustments of: the units of the steady rest to a en posi tion, according to the final size 01 the worlr, and without interference with the other adjusting movements of the parts.

with these objects in view, the invention consists in. the novel construction and arrangement at parts, substantially as hereinafter described and disclosed. in the ac crunpanying drawings and. it will be under stood that any modifications in the specific structural details within the scope of the appended claims may be made, without departing from or exceeding the spirit of the inventionw li i ure 1 repre. cries in use...

a side elevation of FOR GRINDING MACHINES.

1926. Serial No. 105,257.

Iliigure Figure as on the 2 represents a plan view thereof. 3 is a longitudinal. sectional view k line 8-3 of Figure 2, and

Figure is an end view thereof.

Figure 5 is a vertical sectional view as on the line 5-5 of Figure 3.

In the drawings the letter A designates the table of a conventional center grind ing machine on which is mounted the main casting or base 10 ot the improved steady rest. The base 10 has a portion. interlocking with the table A, and in addition is provided with the screw 11 on which is mounted plate 12, the screw exteriorly being flattened and havin, pivoted. thereto the furcations of the cam head 13 of clamp lever 1st. is adapted to bear against the plate 12, pressinn; one side of it against the underside of the table and the other side against the base 10. It will be understood. that coarse adjustment ot the position 01 the clamp lever may be made by rotation of screw 11, while for finer adjustments, and in order that the lever 14: may be at all times most accossibly located, plate 12 is provided with the adjustable abutment screw 15 to adjustably contact with the underside of base 10 and term a fulcrum on which the clamp plate 12 may rock. Carried by the base 10 is a pivot screw 16 for the lower steady rest arm 17, having; a head. 18 to which is adjustably secured. the steady rest shoe 19 as by clamp bolt 20. The arm 17 has a rearward extension 21, adapted to be engaged by a lower end of adjusting screw 22 carried by lug 23 on base 10, and having a knurled head 24;. Downward screwing of member 22 will cause its end to bear against an extension 21 of arm 17, rocking this arm to shift shoe 19 upwardly against the workpiece 25. It will be understood that during grinding there are two directions ot force exerted against the worlr which must be given consideration. ()ne is the lateral. thrust occasioned by the feeding movement of the grinding wheel and the second the downward thrust of the cutting force of the grinding wheel. Shoe 19 is intended to take up this downward thrust and. prevent a springing of the work, on account of this force component of the grinding wheel. It will be appreciated however, that while it is undesirable to allow the work to spring downwardly from the force of the grind 7 an upwardly projecting arm 26 bearing the stop screw 27, designed to contact with lug 23 on base 10, to limit possible swinging movement of arm 17 about its pivot 16. To

' facilitate accurate setting of this stop screw for the final or maximum adjustment to be given the contact shoe when the work is down to size, arm 26 is preferably split as at 28 and a lock screw 29 employed, connecting the furcations formed by the split, whereby tightening of this screw will serve to lock the stop screw 27 in its desired ad justed position.

As has beenmentioned, it is necessary to support the work'not only against a downward pressure but against an outward pressure occasioned by the relative feed of work, and grinding wheel. This is accomplished by forming in the base a slideway 30 for the sliding block 31 which projects forwardly of the upper portion of the base and has a seat or recess 32 to receive the lateral steady rest shoe 33 retained in position on the seat by clamp screw 34.

A cover plate serves as a closure for the 'slideway 30 and has an upstanding bracket portion 36 overlying a slot 37. A

'stud 38 has a squared head 39 extending upward through slot 37 and into the space enclosed by the bracket. This stud is preterably split or furcated and is also tapped to receive the stop screw 40, which is slidable in a passage 41 atthe rear of the bracket, but is adapted to contact with the abutment wall 42 of the front of the bracket. A lock screw 43 serves to secure the screw 40 against accident-a1 rotation or adjustment with respect to head 39.

In use the stop screw 40 is so set that it will just contact with wall 42 and limit forward movement of slide 31 when the steady rest shoe 33 is in position-to properly engage the periphery of a finished work-piece. ()n the other hand, when the slide is withdrawn for removal of the work and insertion of a new workiece or the like, the screw moves as a unit with head 39 and freely through passage 41 in bracket 36, and nowise interferes with withdrawing movement or with actuation of the slide 31. prior to its movement into final operative position.

To accomplish this movement of the slide there is swivelled in the rear of base 10 in alinementwith the slideway 230, the adjustin a threaded socket in slide 31.

ing member 44, having a knurled head 45 and havinga threaded portion 46 engaged Rotation of member '44 will impart an in and out movement to the slide, holding shoe 33 up against the work as desired, while stop screw 4&0 moving with t'lie'slide will, at an. appropriate time, contact with abutment wall 41 and thus positively limit the nmvement ot the slide in the direction of the grinding wheel.

From the foregoing it will be noted that: there has been provided an extremely simple and etlicient mechanism in which a unitary steady rest member may have its base readily positioned on the grinding machine table and quickly locked in adjusted position by suitable movement of the clamp lever 14 and in which the pair of contact shoes shown may each be individually adjusted to properly engage the work-piec(- during its reduction, in which the adjusting devices for the contact shoes are entirely free, clear and accessible, but in which readily adjustable, but )ositively lockable means are provided for (efinitely limiting the adjustment of the contact shoes in the direction of the work.

Attention is also invited to the fact that the two contact shoes are disposed in alinement, one with the other, the lateral shoe being given its adjustment by movement of; its slide, while the shoe engaging the underside of the work is not only capable of adjustment by rocking of its supporting arm 1?, but: in addition, is slotted so that it may be given a vertical adjustment with rcspcct to said supporting arm 17.

It will also be noted that while the shoes are in alinement, the adjusting mechanism for the lower shoe is laterally otisct with re spect to the body of the base, where it will in nowise interfere with the action of the transverse slide 31, but will be readily ac cessible for actuation.

lVe claim 1. A steady rest for grinding machines, including a base portion, a pair of contact shoes, shiitable supports for said contact shoes, means for shifting the supports to adjust the position of the contact shoes. and stop devices carried by the shoe supports for engagement *ith abutments on the bed to limit the movement of the supports.

A steady rest; for grinding machines, including a base portion, a pair of contact shoes, shiftable su 'ipijnts for said contact shoes, means for shifting the supports to adjust the position of the contact shoes. and stop devices carried by the shoe supports for engagement with abutments on thc bed to limit the movement of the support, said stop devices being located at points remote from the adjusting means for the supports.

A steady rest comprising a base having a horizontal slideway, a slide movable in the slideway, a contact shoe carried by the slide. a screw adjusting member swivelled to the base and in threaded engagement with the slide for adj ustmcnt thereof, a lug project ing from the slide, a stop screw adjustablv supported in said lug and an abutment meniber on the base proji-acting into the path of Ill) movement of the stop screw whereby shifting of the slide in one direction will be limited by interengagement of the stop and ahutn'ient.

e. A stezuly rest construction including a base, a pivot carried by the base, an arm oscillatable about the pivot, a contact shoe adjustably carried by said arm and a pair of angularly related extensions on the arm at the opposite side of the pivot from the screw, adjusting means on the bed engagii'lg one of said extensions for rocking the arm about its pivot, and stop means on the other of said extensions adapted to engage the bed to limit the rocking movement of the arm.

5. A steady rest for grinding machines, including a base portion for application to the table of the grinder, said portion having a slideway formed therein, a slide movable in the slideway, a contact shoe carried by the slide, an adjusting member swivelled to the base adjacent the slideway and. having threaded engagement with the slide for ad justinent thereof, a cover plate for the slideway having a slot formed therein and a bracket portion overlying the slot, a stud carried by the slide and movable in the slot, and an adjustable stop device carried by the stud and having a portion for engagement with the bracket to limit the movement of the slide in one direction.

In testimony whereof We ailix our signatures.

SOL EINSTEIN. LES'ITER F. NENNINGEB, 

